CN1340256A - System and orthogonal coding in a telecommunications environment using orthogonal and near-orthogonal codes - Google Patents

Abstract

A system and method for permitting variable information rates and improved error performance using orthogonal or near-orthogonal codes is disclosed. This is achieved by simultaneously transmitting two or more Walsh code words from a given orthogonal code set and/or by transmitting multiple shorter orthogonal codewords sequentially such that their combined length equals the original codeword. It should be emphasized that the present invention can be used with any orthogonal or near-orthogonal code set.

Description

Utilize quadrature and near system in the telecommunications environment of orthogonal code and orthogonal coding a kind of

Describe

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to field of telecommunications and more specifically, relate to and a kind ofly be used for providing the user variable information rate and utilizing orthogonal code to improve the system and method for performance and bandwidth usage for the telecommunication system of error control.

2. description of Related Art

Cellular telephone industry has stepped outstanding generation in step in global commercial operation.Growth in main metropolitan area has expected also exceeding power system capacity head and shoulders above.If this trend continues, the influence that increases is with the market that reaches even those are minimum at once fast.The outstanding problem relevant with sustainable growth is that user base number is being expanded and distributed to the sum that the cellular service supplier is used to transmit the electromagnetic spectrum of radio communication and remains limited.Need the solution of innovation to satisfy in limited available spectrum these growing capacity needs and keep high-quality service and avoid improving price.

Current, channel inserts and mainly utilizes frequency division multiple access (FDMA) and time division multiple access (TDMA) method to realize.In the FDMA system, a physical communication channels comprises a single radio frequency band, and the transmitted power of a signal is concentrated in wherein.In tdma system, physical communication channels is included in a time slot in the periodicity time interval sequence that sends on the same radio frequency.The usual method that realizes tdma system is equally in conjunction with FDMA.

Spread spectrum comprises a kind of communication technology, is seeking commercial the application as a kind of new channel access method in radio communication.Preliminary spread spectrum system approximately exists from the date of World War II.Early stage application is mainly towards military affairs (relating to intelligent jamming station and radar).Yet, in communications applications, utilize today spread spectrum system that growing interest is arranged, such communications applications comprises the digital cellular radio, land mobile radio and indoor/outdoor personal communication network.

The spread spectrum operation is different from common TDMA and FDMA communication system fully.In a kind of direct sequence CDMA (DS-CDMA) spread spectrum transmitter, for example, will expand to " sheet " speed for the stream of digital symbol of a given special use on basic symbol speed or common signal channel.This spread spectrum operation comprises the spreading code that channel is unique (being called as " characteristic sequence " sometimes) and is applied to symbols streams, increases its transmission rate (and bandwidth requirement) when increasing redundancy.Typical way is, during expanding with unique digital code multiplier word symbols streams.(spread spectrum just) that then, will comprise that the M signal of this generated data sequence (sheet) and other quilt handled similarly and other (special-purpose or public) relevant M signal additions of channel.

Then, will be M signal after unique scrambling code (be commonly called " long code ", because in most of the cases, it is than spread spectrum code length) is applied to this addition to a base station, be used on communication medium, carrying out the output signal of multichannel transmission with generation.Like this, share a transport communication frequency range easily from the M signal that various special uses or common signal channel obtain, these a plurality of signals all overlap each other in frequency domain and in time-domain.Because the spreading code that is applied is unique for each channel, and each M signal that is sent out on the communication frequency of sharing is unique equally, can be at receiving terminal by using correct treatment technology and other M signal distinguishes.

In DS-CDMA spread spectrum mobile radio station (receiver), by using (just, multiply each other, or coupling) suitable scramble and spreading code carry out the signal that despreading recovers these receptions, perhaps remove this coding and get back to basic symbol speed from desirable transmission signal.Wherein this spreading code is applied to other M signals that sends and be received, yet, the just noise of generation.Therefore in fact the despreading operation comprises correlated process, and the signal that receives and suitable digital code are made comparisons, and recovers desired information from this channel.

With orthogonal code or be used for the error control of telecommunication system near orthogonal code (sign indicating number that just, has high relatively relative auto-correlation and low relative cross correlation value).The Walsh sign indicating number is a kind of example of orthogonal code.In the encoding scheme of utilizing the Walsh sign indicating number, utilize the Hadamard conversion that k position information word (" information word ") is transformed to 2 ^kBit sequence.A kind of like this conversion is called (2 in present patent application ^k, k) orthogonal code.The Walsh representation that is used for 2 information sequences are encoded into 4 orthogonal codes is as follows: $H_4=\left[\begin{array}{cccc}1& 1& 1& 1\\ -1& 1& -1& 1\\ 1& 1& -1& -1\\ 1& -1& -1& 1\end{array}\right]$

At this, the matrix H of four lines ₄Form the code word that is used for four information symbol sequences, the binary value of this sequence equals the numerical value of four lines index.For example, can be with information sequence (0,0), (0,1), (1,0) and (1,1) map respectively are code word (1,1,1,1), (1 ,-1,1 ,-1), (1,1 ,-1 ,-1) and (1 ,-1 ,-1,1).Then quick Hadamard transformation is used for incoherent ground demodulation input signal.This quick Hadamard transformation plays a part a correlator, then can those code words (or component) of the highest correlation are identified as the code word that is sent with having.The uniqueness of map makes it possible to unambiguous the symbol that is sent is detected and decodes between 2 information sequences and 4 symbol code words (in last example).

The use of Walsh-Hadmard sign indicating number described above causes 2 ^k(just, k position information word expands to 2 in the bandwidth expansion of/k ^kThe code word of position), this is quite high.The inverse of bandwidth expansion is called as code rate.Therefore, these Walsh-hadamard sign indicating numbers are used in the environment of low-down signal noise ratio usually.For example, the IS-95 cdma system compensates signal-to-jamming ratio low in system by using these yards.Using for the another kind of these schemes is in the random access protocol for honeycomb and moving satellite system, and wherein the user can attempt to be synchronized at the very start system, perhaps attempts starting one calling out or answer an incoming call.

Wish to find the new technology of the code rate of improvement in the telecommunication system that adopts orthogonal code always.Find the technology that is used to reduce the bandwidth expansion also to feel it is desirable.Therefore, adopt the desirable telecommunication system of orthogonal code will only have such bandwidth expansion, make that it is necessary separating for the multiple transmission from each user, and the factor big less than ether reduces the efficient that spectrum is utilized.

Summary of the invention

Therefore a main purpose of the present invention is to utilize orthogonal code to provide improved performance in the telecommunication system of error control.A further object of the present invention is the bandwidth expansion that is reduced in such telecommunication system.The code rate of improvement in the telecommunication system that adopts orthogonal code also is one object of the present invention.

Orthogonal code or be used to the error control in the communication system near orthogonal code (sign indicating number that just, has high relative auto-correlation and low relative cross correlation value).For example, IS-95 cdma cellular standard uses (64,6) the quadrature Walsh sign indicating number on reverse link (link from the mobile radio station to the base station just) to supply error control.Just as noted, such one group of Walsh sign indicating number is transformed to each information word of 6 code word of 64 symbols in such a way, makes that each is mutually orthogonal in 64 64 such symbolic codes.

The present invention can offer the user together with quadrature or near the use of orthogonal code with variable transmission rate and/or improved error performance.In one embodiment of the present invention, this is to represent that by parallel (simultaneously just) each code word of transmission a plurality of code words of different information sequences realize.In the optional embodiment of another kind, a plurality of short orthogonal codes with higher code rate are sequentially sent (one after another), make that their pattern length is identical with original code word.In expansion of the present invention, with this two kinds of methods combination, not only simultaneously but also sequentially send some groups of short code words.

When multiple code word was sent simultaneously, relevant decoder needed to determine the relative order of the code word that sent simultaneously.In optimum implementation of the present invention, the part of the information sequence that is encoded is used for this purpose.The sequence selection that receiver receives by utilization has the codeword decoding of these code words to being sent of high correlation.

Be noted that and with quadrature or be used near orthogonal code in the encoding scheme of some cascade.For example, the encoding scheme of a kind of cascade of IS-95 CDMA standard code, wherein a kind of have speed be 1/3 and constraint length be that the back of 9 convolution code is duplication code and (64,6) Walsh sign indicating number.In this IS-95 standard, convolution code is called foreign key and the Walsh sign indicating number is called internal code.Have quadrature or be used as in the concatenated coding system of internal code the error performance that the transmission of multiple code word (not only simultaneously but also in proper order) can be used to increase the redundancy of foreign key and may improve whole encoding scheme under the situation that keeps identical total bandwidth to expand near orthogonal code a kind of.In this way, system and method for the present invention can be used for providing variable transmission rate and possible improvement error performance to the system that utilizes concatenated coding.

The object of the invention is by better bandwidth usage, makes it possible to variable information rate or improved error performance with quadrature or near the coding of quadrature.This be by send simultaneously two or more from a given orthogonal code collection code word and/or sequentially send a plurality of short orthogonal codes, make their pattern length equal that long code word realizes.Should emphasize that the present invention can utilize any quadrature or near the sign indicating number collection of quadrature.

System and method of the present invention can be used in the various application, for example, at wireless communication system, cellular radio, satellite communication, TV and radio transmit simultaneously, land mobile radio and cellular system, etc.The use of the technology of Xiang Xishuominging in this application allows information rate to increase and is not accompanied by the increase that bandwidth needs.This information rate that increases can be used for providing variable information rate to the user.

On the one hand, the present invention is a kind of be used to the improve code efficiency of code division multiple access (CDMA) transmission channel and system and method for bandwidth usage.Technology of the present invention is divided into two each moieties with k position by the information word that will have the 2k position originally and makes the original information word with 2k position is encoded effectively and transmitted.

The part of this original information word is expanded with the single position with null value.Is that 1 single position is expanded with another part of this original information word with having value.Can be by be inserted into the expansion of carrying out half-word in the half-word to half-word prefix or suffix extra order or with extra order.

Then, two of the k+1 position half-words that are expanded are used (2 ^K+1, k+1) the Walsh sign indicating number is encoded, and obtains the Walsh code word of two correspondences, and each has 2 ^K+1Symbol.Two Walsh code words are added, and obtain one and have 2 ^K+1The Walsh code word of the combination of symbol.Optionally way is to have 2 then ^K+1The Walsh code word of the combination of symbol is modulated and aloft send on the interface.If have 2 ^K+1The Walsh code word of the combination of symbol is modulated and aloft send on the interface, in another aspect of this invention in, this transmission is received on the interface aloft and by demodulation, is reverted to right combination Walsh code word, each has 2 ^K+1Symbol.

In another aspect, system and method for the present invention also provides a kind of technology, is used for the demodulated combination Walsh code word that receives on code division multiple access (CDMA) transmission channel is decoded.In this respect, the combination Walsh code word of at first utilizing quick Hadamard transformation to receive is decomposed into its component Walsh code word.Then, with each component Walsh codeword decoding, to obtain relevant information half-word.

Value according to the index bit on the ad-hoc location in half-word is zero or 1, and decoded information half-word is categorized as two catalogues.Further decoded information half-word is classified by decline order relevant between Walsh code word relevant with half-word and the combination Walsh code word that receives then.Then index bit is deleted from two information half-words with the highest correlation, obtained two corresponding data half-words.Two data half-words are recovered the original information that is sent by with the order specified cascade then.

On the other hand, system and method for the present invention can be extended to and send a plurality of information encoded partial words.In this respect, one has the original information word that M takes advantage of K position binary message and is divided into M message part word, and each has the K position.Each quilt and N index bit cascade or combination in M the message part word, wherein N equals [log at least ₂M].

In optimum implementation of the present invention, m ^ThThese index bits of message part word are binary representation formulas of m-1.As described above, the N index bit can be by message part word prefix, suffix or the mixing with the k position.Utilize one (2 then ^K+N, K+N) the Walsh sign indicating number is with M message part word code that is expanded of K+N position, and to obtain one group of M Walsh code word, each has 2 ^K+NIndividual symbol.With the addition of M Walsh code word, what obtain addition has 2 then ^K+NThe Walsh code word of individual symbol can randomly modulate and send on a broadcast channel.

Relevant decoder of the present invention at first carries out demodulation to the Walsh code word of the combination that receives on code division multiple access (CDMA) transmission channel.Be 2 then with the length that receives ^K+NThe combination Walsh code word of individual symbol is utilized quick Hadamard transformation to resolve into each to have 2 ^K+NThe component Walsh code word of the M of an individual symbol catalogue.Then, to the component Walsh codeword decoding of M catalogue, to obtain the message part word of M catalogue, each length is the K+N position.

Choose the component of the decoded message part word of M catalogue according to the binary value that in N index bit of partial words, is comprised.With each is classified by the correlation of the decline between the Walsh code word of Walsh code word relevant with partial words and the combination that receives in the decoded message part word of M catalogue.

Then each chooses the partial words of the highest ordering from M catalogue, then by from N index bit of each partial words deletion, the individual selected partial words of these M is transformed into the data division word of M K position.At last, utilize index bit, recover original information word the order assembling in accordance with regulations of M data partial words.

In another embodiment of the invention, will have the original information word that M takes advantage of the binary message of K position and be divided into M message part word, on average each has K position (M * K=K just, ₁+ K ₂+ ... + K _m).With each and the combination of N index bit in M the message part word, wherein N equals [log at least ₂M].The remainder that is used for the Code And Decode process of this embodiment of the present invention is that the situation that has equal length with former M message part word is identical.

On the other hand, the invention discloses a kind of being used for to having [log ₂(2 ^2K-1+ 2 ^K-1)] system and method for raw information word code of position binary message.In this respect, at first setting up length is 2 ^KThe Walsh sign indicating number collection that is expanded of individual symbol.The Walsh sign indicating number collection that this is expanded comprises all having 2 ^KThe combination of the Walsh code word of the list of individual symbol-Walsh code word and all two 2K symbols.

The information word map that each is different is to the combinations Walsh sign indicating number collection that is expanded from this or a simple code word or two code words.If with information code word map to a simple Walsh code word, the modulated and transmission of simple code word.If the information code word is by the combination of map to two a Walsh code word, then two Walsh code words are modulated and are sent by addition concurrently.If suitable, all code words that are sent out are buffered, and obtaining length is 2 ^KIndividual symbol is unified the Walsh code word of framing.

Relevant decoder of the present invention is the combination Walsh codeword decoding to receiving on the telecommunication channel that adopts orthogonal code at first.Defined threshold value at first is arranged on maximum acceptable difference in the right correlation of the Walsh code word that receives.

Utilizing quick Hadamard transformation is 2 with the length that receives ^KThe combined codeword of individual symbol is decomposed into each and has 2 ^KOne or more component Walsh code words of individual symbol.Component Walsh code word is by the decline order classification by correlation between component code word and the combination Walsh code word.

If the difference between their correlation, is then selected two component code words of high ordering less than the threshold value of defined from catalogue.On the other hand, if two the difference between the correlation of the component code word of high ordering then have only the component Walsh code word of the highest ordering to be selected greater than the threshold value of defined for decoding.At last, map list is used to check and the relevant information word of selected Walsh code word.

In another aspect of this invention,, utilize one (2 by information word being divided into the information word serial code that first with K+M position and the second portion with K-M position will have the 2K position ^K+M, K+M) the Walsh sign indicating number obtains having 2 with the information word first coding of K+M position ^K+MThe one Walsh code word of individual symbol.Utilize one (2 ^K-M, K-M) the Walsh sign indicating number obtains having 2 with the information word second portion coding of K-M position ^K-MThe 2nd Walsh code word of individual symbol.Then, with the cascade of two Walsh code words, obtain having 2 ^K+M+ 2 ^K-MA Walsh code word that is expanded of individual symbol.Then, the Walsh code word modulation that this is expanded also aloft sends on the interface.

The decoder relevant with above encoding scheme be the combination Walsh code word demodulation to receiving on the telecommunication channel that adopts orthogonal code at first, obtains the Walsh code word of cascade, comprises that two Walsh code word-length that sequentially send are 2 ^K+MSymbol, another length are 2 ^K-MSymbol, this Walsh code word frame that receives at first is divided into it component Walsh code word to (length 2 ^K+MWith 2 ^K-MSymbol).

Then utilize quick Hadamard transformation with component Walsh code word to being transformed into a pair of message part word with K+M position and K-M position.Then with the message part word that is transformed to re-assembly (as the order that is received by them) by the order of predesignating, to recover to have the original information word of 2K position.

In another embodiment of the invention, have the original information word that M takes advantage of K position binary message with one and be divided into M message part word, on average each K position (M * K=K just, ₁+ K ₂+ ... K _m).With each and the combination of N index bit in M the message part word, wherein N equals [log at least ₂M].(may be unequal) partial words with these M expansions is 2 as length then ^K, 2 ^K2... 2 ^KmThe M of individual symbol Walsh code word sequentially sends.Be used for this embodiment of the present invention the Code And Decode process remainder be that situation about equating is similar on length sequentially sending part.

The encoder of a kind of simplification that the encoding scheme identical with this is relevant at first carries out demodulation to the combination Walsh code word that receives on the telecommunication channel that adopts orthogonal code, to obtain the Walsh code word of cascade, comprise M Walsh code word that sequentially sends, each length is 2 ^KIndividual symbol.This Walsh code word frame that receives at first is divided into each has 2 ^KThe M of individual symbol component Walsh code word.

Then, utilize map list with each is transformed to the message part word of K position in M the component Walsh code word.Then, M message part word that is transformed re-assemblied by the order that they receive, to recover to have the original information word that K takes advantage of the M position.

The accompanying drawing summary

With reference to the detailed description of following optimum implementation, can obtain method and system of the present invention is understood more fully in conjunction with the drawings, wherein:

Fig. 1 is a kind of graphic representation of orthogonal coding scheme of the present invention, and wherein the different piece of information word is sent concurrently;

Fig. 2 illustrates the decoder of the orthogonal coding scheme of the various piece of utilizing parallel transmission information word;

Fig. 3 illustrates the decoder that is used for the orthogonal coding scheme, and wherein the sign indicating number collection comprises certain combination of single codeword and two code words;

Fig. 4 illustrates the optional embodiment of another kind of the present invention, and wherein a plurality of message parts-word is sent on transmission channel serially;

Fig. 5 illustrates with serial of the present invention and sends the relevant decoder of embodiment;

Fig. 6 is with the flow chart that explains another embodiment of the present invention, wherein uses serial and parallel transmission technology simultaneously;

Fig. 7 is the flow chart that can be used for each step of the exemplary signalling scheme in a kind of variable transmission rate telecommunication system; With

Fig. 8 is with explaining the use that utilizes multiple antenna that space-time diversity is provided flow chart of the present invention.

Optimum implementation is described

By considering that one is utilized (2 ¹⁰, 10) and the Walsh sign indicating number can explain system and method for the present invention best as a system of illustrative example.As those skilled in the art understood and recognize, this encoding scheme causes being similar to 100 times (just, bandwidth expansion 20dB), perhaps equivalently, has code rate and is 10/1024 (just, each information word of 10 is by map in 1024 code word set, and each code word has 1024 symbols and is quadratures with respect to 1023 code words of concentrating other).

At first consider the parallel transmission of two orthogonal codes, as shown in fig. 1.Suppose shown in the figure l that the K value is 9 in the example.In this exemplary first embodiment of the present invention, 18 information bits are divided into two groups 101,9 every group.Then, different extra orders is inserted into or attaches on each information word, shown in 102 and 103.A kind of mechanism of the relative order that is used to stipulate two information half-words is provided like this and helps to guarantee that two half-words can correctly be re-assemblied on receiver.

In optimum implementation of the present invention, extra order is by the least significant bit (LSB) of suffix as the information half-word that is expanded.Therefore, the odd-numbered line of Hadamard matrix is corresponding to the information half-word with suffix " 0 ", and the even number line of Hadamard matrix is corresponding to the information half-word with suffix " 1 ".

In another embodiment of the invention, extra order is by the most significant digit of prefix as the information half-word that is expanded.This scheme cause the Hadamard matrix the top half corresponding to information half-word with prefix " 0 ", and the bottom of Hadamard matrix half corresponding to information half-word with prefix " 1 ".The example of being considered in the remainder of present patent application will be based on the prefix technology of suffix technology rather than attaching index bit.Then, should emphasize that two kinds of technology are applicable to all modification of the present invention described herein comparably.And, being noted that all index bits not necessarily need by prefix or suffix, perhaps or even adjacency, in fact can be inserted on the position of selecting in advance in the combined characters.

Utilize one (2 then ¹⁰, 10) and the Walsh sign indicating number is two 10 exemplary information half-word coding, shown in 104 and 105, obtains two 1024 code word.Be noted that because different positions is attached to each information half-word, using (2 ¹⁰, 10) and resulting two code words are guaranteed to be different after the Walsh sign indicating number coding.These code words are by 106 added together then, 107 modulated, and aloft are sent out simultaneously, as shown in fig. 1.This scheme can be shown causes efficient coding speed to be 18/1024 (just, each information word of 18 can by the code word combination of map to two 1024 symbol uniquely).

The decoder that is used for Fig. 1 encoding scheme is shown in Fig. 2.By utilizing the quick Hadamard transformation shown in 201, with the waveform and 2 that receives ^K+1Each is correlated with and realizes decoding to information symbol in the individual possible code word that is sent out.

The code word component is divided into two parts, and first is by forming corresponding to the code word of the information half-word that finishes with zero (" 0 ") position, and second portion is corresponding to the information half-word that finishes with position, 1 (" 1 ").The code word component of maximal correlation is elected to be the code word that is sent out 202 and 203 shown in each half.These Walsh code words at first 204 and 205 by demodulation.Then, the position of the back of two decoded half-words is abandoned 206 and 207.The position that utilizes the back then 208 with the cascade of two information half-words, obtains the information word of decoded (originally) as the index of rearrangement.

In above scheme, (just, 262,144 sign indicating number collects, rather than utilizes 2 to have 512 * 512 by utilization ¹⁰(just, 1024 code words) orthogonal code collection has improved the utilization of bandwidth.Therefore, new sign indicating number collection comprises that two all possible combinations of code word, its relevant information half-word have different last positions.In another embodiment of the invention, by considering that institute except two code words might make up, also comprise a sign indicating number collection of 1024 original single codewords, can further improve bandwidth usage.This causes one to have altogether ¹⁰²⁴C ₂The sign indicating number collection of the individual code word in+1024 (just, 524,800).

Because each code word is by map to a different information word, we have more code word for the information word of similar number now.These 524,800 information words can be used [log ₂524,800] position (just, 19) expression.Therefore exist from about 19 information word to 524, several maps of 800 code words that can use, allowing code rate is 19/1024, this is corresponding to a kind of further improvement of 18/1024 the code rate that the scheme of utilizing the front is obtained.

The decoder relevant with this alternative plan is shown among Fig. 3.The coding of alternative plan hereto, except two Walsh code words with high correlation not 304 find out, be that foregoing like that supposition transmission now is single Walsh code word, and supposition has, and the Walsh code word of high correlation is the code word that is sent out 305.Stipulate two between the correlation of high code word the threshold value setting of maximum difference be used in 304, determine whether that one or two Walsh code word is sent out.Use with the information word map to specific code word or code word combination check table 307 with selected codeword decoding.

Generally, we can expand to the situation that sends N Walsh code word (wherein N 〉=2) simultaneously with two kinds of schemes described above.In the encoding scheme shown in Figure 1, [log ₂N] each message part word of position is retained, and is used for the order that the regulation code word sends.As noted earlier, these ordering positions can be by prefix or suffix to the message part word.

In second encoding scheme described above, the combination of two all code words and all single codewords are formed the sign indicating number collection of the information word that is used to send segmentation, the decoder of Fig. 3 must at first be determined the sum of the Walsh code word that is sent out, use map list to determine the information word accurately that is sent out then.Therefore, compare with first encoding scheme, second encoding scheme has bandwidth usage preferably, is cost with higher complexity and (possibility) lower error performance still.

Fig. 4 illustrates the another kind of technology that is used to obtain the parallel transmission scheme same band efficient crossed with above detailed description.In this embodiment of the present invention, the information word quilt with 2K position originally is at 401 separated into two parts.Utilization is as in (2 shown in 402 and 403 ^K, K) the Walsh sign indicating number is to two message part word codes.Each has original code word size half in these two code words.Two code words are used as 2 in 404 and 405 modulation and 406 ^K+1Bits Serial ground sends.

As illustrative example, consider that the front was used identical (2 ¹⁰, 10) and orthogonal code.As follows, by sequentially sending two 512 symbols (just, 2 ⁹Individual symbol) code word, we can obtain bandwidth usage preferably.The pattern length that these code words that send in proper order are right is the length identical with original code word.Yet, be 9+9 position (just, 18) by the information bit number that sequentially sends a pair of such codeword coding.Therefore, it is 18/1024 (as first encoding scheme) that this technology also has code rate, rather than with (2 ¹⁰, 10) and 10/1024 relevant code rate of encoding scheme.

Fig. 5 illustrates the decoder relevant with the serial transmission scheme.Decoder is flat-footed, comprises two decoders 503 and 504, is used to realize short (512-symbol) Walsh sign indicating number of the quick Hadamard transformation of mistake as discussed above.Two code words 501 and 502 are decoded independently 503 and 504 respectively, and decoded information word 505 is in the same place by the order cascade that receives with 506.Generally, we can N is individual sequentially to be sent than short code word to allowing with this third technological expansion, wherein N 〉=2.

In another embodiment of the invention, with original code word (just, the code word of 1024 symbols in the example of above discussion) a new code word of equal length is sent out, replace using a plurality of short code words, but wherein new code word belongs to a sign indicating number family with higher code rate.This embodiment is in a new code word of utilizing with original code word equal length, and allowing had more information bit to be encoded than in the past.The Reed-Muller sign indicating number is an a kind of like this example of higher rate sign indicating number.

Fig. 6 illustrates by simultaneously not only with serial but also send code word with parallel mode and can obtain how high actually bandwidth efficiency.The bandwidth efficiency of this assembled scheme is calculated once more, supposes that original sign indicating number is (2 ¹⁰, 10) the Walsh sign indicating number.As Fig. 6 illustrated, this embodiment of the present invention comprises and sequentially sends two set of code words, wherein is made up of two Walsh code words that send simultaneously for every group.

By K=8 among the supposition figure, be appreciated that the example shown in Fig. 6.611 we at first with 0 first of being attached to 8 information bits, 612 with 1 second of being attached to 8 information bits.Right latter two piece of 9 is utilized (2 613 and 614 ⁹, 9) and Walsh sign indicating number coding, the code word of two 512 symbols of composition.These code words are formed 512 symbols by in 615 additions then, as shown in 616.Equally, as shown in the 621-626, third and fourth of information bit is encoded, and forms second 512 symbols.Then, these two 512 symbols are sequentially sent, as shown in 630.

The transmission that is noted that 1024 synthetic symbols is the length identical with original code word.Yet, be 32 with the number of this final solution information encoded position.Therefore, the code rate of this scheme is 32/1024.Decode procedure for this assembled scheme is to utilize the decoder of Fig. 2 to each carries out in two 512 symbolic blocks that are received, and then four decoded information words is arranged in together in order, rebulids 32 information bits that are sent out.

Be noted that also disclosed in the present invention different encoding schemes can be used to be supported in transmission rate variable between the transmitter and receiver,, thereby have different information rates because each above scheme that describes in detail has different bandwidth usages.Have only when the control signal between the transmitter and receiver be permission when practicable, support that variable transmission rate is only possible.A kind of scheme of possible variable transmission rate is shown among Fig. 7.In this scheme, receiver 702 sends signals to transmitter 701, perhaps reduces (707) or increases (705) its transmission rate, and this depends on the frame error number that is detected in the period Tn at a fixed time, n on receiver 702.Accurate message count is set up in Receiver And Transmitter communication in a kind of like this scheme, finishes speed in view of the above and changes.Encoding scheme corresponding to various transmission rates is pre-arranged, and transmitter rises between these grades or descends according to the incoming level of receiver.Be noted that the variable bit rate system can realize with various mode, more than the example that has been provided just with explaining the use of the present invention in such system.

For example, a kind of variable bit rate system of not belt controling signal can utilize a threshold value to realize, as previously described, detects whether one or more code word is sent concurrently.If have only a code word to be detected, receiver hypothesis a kind of system (for example, (10,1024) system) than low rate.On the other hand, if two or more code word is detected, receiver is supposed a kind of higher rate system ((18,1024) system as previously described).

Also be noted that other forms of diversity, for example multiple antenna also can further improve bandwidth usage and performance in company with encoding scheme effect of the present invention.For example, many set of code words can be from different antenna transmission.Fig. 8 illustrates a kind of like this multiple antenna system, and the example that this is based on Fig. 1 is used for transmitting simultaneously two code words.Multiple antenna 809 and 810 can be used, and polarization diversity and/or space diversity are provided.A kind of like this multiple antenna system can be the part of TV and radio broadcasting while broadcast system, uses at cellular system, and land mobile radio system, paging network and indoor net are for example in the local area network (LAN).

Be noted that described invention can be in company with any quadrature or near the use of orthogonal code collection, the Walsh sign indicating number is used in the above discussion just in order to describe easily.

Though a kind of optimum implementation to method and apparatus of the present invention is described in the accompanying drawings, be described in the detailed description in front, be appreciated that, the present invention is not limited to disclosed embodiment, but can do many rearranging, revise and replace and do not depart from spirit of the present invention by following claim defined.

Claims (57)

1. one kind to having the original information word Methods for Coding of K position, improves the code efficiency and the bandwidth usage of the telecommunication channel that utilizes orthogonal code, and described method may further comprise the steps:

Original information word is divided into M partial words, and each has K respectively in the described M partial words ₁, K ₂... K _MThe position;

By each partial words and relevant N position index word being integrated each of M partial words described in the original information word of expansion, described relevant N position index word comprises a unique identifier, it and a specific partial words are interrelated, and the length of index word is subjected to relational expression N 〉=[log ₂M] constraint;

Utilize one (2 ^Km+N, Km+N) the Walsh sign indicating number is to K _mThe described partial words coding that is expanded of each of+N position obtains one and has 2 ^Km+NThe Walsh code word that is expanded of individual symbol, wherein m get 1 and M (comprising M) between integer value in succession; With

With M Walsh code word addition that is expanded, obtain having 2 ^Kmax+NThe Walsh code word of the addition of individual symbol, wherein K _Max=max[K ₁, K ₂... K _M].

2. method as claimed in claim 1 is used to improve the code efficiency and the bandwidth usage of a channel that utilizes orthogonal code, and wherein original partial words is divided into two partial words.

3. method as claimed in claim 2 is used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of a channel, and wherein two described partial words equate on length.

4. method as claimed in claim 1 is used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of a telecommunication channel, may further comprise the steps in addition:

Modulation and aloft sending on the interface has

The described Walsh code word that is added of individual symbol.

5. method as claimed in claim 4, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, as being applied to code division multiple access (CDMA) telecommunication system, wherein said step to the described Walsh code word modulation that is added is included in the step that sends before the waveform signal spread-spectrum in addition.

6. method as claimed in claim 4 is used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, may further comprise the steps in addition:

Aloft receive on the interface and to having

The described Walsh code word demodulation that is added of individual symbol.

7. one kind to having the original information word Methods for Coding of 2K position, improves the code efficiency and the bandwidth usage of the telecommunication channel that utilizes orthogonal code, and described method may further comprise the steps:

Original information word is divided into first and second portion, and each described part has the K position;

With described first of original information word and one with null value single position cascade;

With described second portion of original information word and one with 1 value single position cascade;

Utilize one (2 ^K+1, K+1) the Walsh sign indicating number obtains having 2 to first's coding of the described original information word that is cascaded of K+1 position ^K+1The one Walsh code word of individual symbol;

Utilize one (2 ^K+1, K+1) Wal sh sign indicating number obtains having 2 to the second portion coding of the described original information word that is cascaded of K+1 position ^K+1The 2nd Walsh code word of individual symbol; With

With a described Walsh code word and described the 2nd Walsh code word addition, obtaining one has 2 ^K+1The Walsh code word that is added of individual symbol.

8. method as claimed in claim 7, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, wherein said first with described original information word is by the first of described 0 prefix to described original information word realized with the step of one with null value single position cascade.

9. method as claimed in claim 7, be used for and improve the code efficiency and the bandwidth usage of telecommunication channel with orthogonal code, wherein said step with the described first of original information word and one with null value single position cascade is by realizing the described first of described 0 suffix to original information word.

10. method as claimed in claim 7, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, wherein said step with the described second portion of original information word and one with 1 value single cascade is by realizing described 1 prefix to the described second portion of original information word.

11. method as claimed in claim 7, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, wherein said step with the described second portion of original information word and one with l value single cascade is by realizing described 1 suffix to the described second portion of original information word.

12. method as claimed in claim 7 is used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, may further comprise the steps in addition:

Modulation also aloft sends on the interface and has 2 ^K+1The described Walsh code word that is added of individual symbol.

13. method as claim 12, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, as being applied to code division multiple access (CDMA) telecommunication system, wherein said step to the described Walsh code word modulation that is added is included in addition to the former step to signal spread-spectrum of waveform modulated.

14. as the method for claim 12, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of telecommunication channel, may further comprise the steps in addition:

Receive also demodulation aloft on the interface and have 2 ^K+1The Walsh code word of the described addition of individual symbol.

15. one kind utilize orthogonal code on telecommunication channel, receive by the method for the combination Walsh codeword decoding of demodulation for original information word, may further comprise the steps:

The combination Walsh code word of utilizing quick Hadamard transformation to receive is decomposed into component Walsh code word;

To each described component Walsh codeword decoding that may send, obtain relevant possible message part word;

Described decoded possible message part word is separated into first catalogue and second catalogue, described first catalogue is included in the decoded message part word that has 0 on the second place that the decoded message part word that has 1 on the primary importance of defined and described second catalogue be included in defined;

With first directory sorting of the correlation that descends between component Walsh code word relevant and the described combination Walsh code word that receives to described decoded message part word with message part word in described first catalogue;

With second directory sorting of the correlation that descends between component Walsh code word relevant and the described combination Walsh code word that receives to described decoded message part word with message part word in described second catalogue;

Message part word by selecting the highest ordering from described first catalogue and from 1 of the primary importance deletion of described defined, the synthetic first data division word;

Message part word by selecting the highest ordering from described second catalogue and from 0 of the second place deletion of described defined, the synthetic second data division word; With

With the order cascade in accordance with regulations of the described first and second data division words, obtain original information word.

16. as the method for claim 15, the combination Walsh codeword decoding by demodulation that is used to utilize orthogonal code to receive on telecommunication channel becomes original information word, wherein said 1 by suffix to described data division word.

17. as the method for claim 15, the combination Walsh codeword decoding by demodulation that is used to utilize orthogonal code to receive on telecommunication channel becomes original information word, wherein said 1 by prefix to described data division word.

18. as the method for claim 15, the combination Walsh codeword decoding by demodulation that is used to utilize orthogonal code to receive on telecommunication channel becomes original information word, wherein said 0 by suffix to described data division word.

19. as the method for claim 15, the combination Walsh codeword decoding by demodulation that is used to utilize orthogonal code to receive on telecommunication channel becomes original information word, wherein said 0 by prefix to described data division word.

20. one kind to having the original information word Methods for Coding that M takes advantage of K position binary message, improves the code efficiency and the bandwidth usage of the telecommunication channel that utilizes orthogonal code, described method may further comprise the steps:

Original information word is divided into M message part word, and each has the K position in described M the message part word;

With each and N index bit cascade in described M the message part word, wherein N is not less than [log on length ₂M] position, be used for m ^ThThe index bit of message part word is the binary representation formula of m-1;

Utilize (2 ^K+N, K+N) the Walsh sign indicating number obtains one group of M Walsh code word to the described message part word code that is cascaded of K+N position, and each has 2 ^K+NIndividual symbol; With

Code word addition with described M Walsh Codeword Sets obtains having 2 ^K+NThe Walsh code word that is added of individual symbol.

21. a method that is become original information word by the combination Walsh codeword decoding of demodulation of utilizing orthogonal code to receive on telecommunication channel, described combination Walsh code word is 2 ^K+NSymbol is long, comprises M quadrature Walsh code word, and described method may further comprise the steps:

Utilize quick Hadamard transformation, the combination Walsh code word that receives is resolved into each have 2 ^K+NThe M of individual symbol component Walsh code word catalogue, each comprises the code word of the index that contains defined in the described catalogue;

To each decoding in described M the component Walsh code word catalogue, obtain M message part word at least, wherein each is that the K+N position is long;

According to the binary value in each N the specific index bit in the decoded message part word of M, with each classification of described decoded message part word;

With the correlation of component Walsh code word relevant and the decline between the described combination Walsh code word that receives with decoded message part word in the described catalogue to each ordering in M the decoded message part word catalogue;

By each N index bit selecting the decoded message part word of the highest ordering and deletion in described decoded message part word, to be comprised from a described M catalogue, synthesize M data partial words; With

Described M data partial words by specific order assembling, obtained original information word.

22. one kind is utilized orthogonal code to having [log ₂(2 ^2K-1+ 2 ^K-1)] the prime information word code method of position binary message, utilize the code efficiency and the bandwidth usage of the telecommunication channel of orthogonal code in order to improvement, described method may further comprise the steps:

Setting up length is 2 ^KThe Walsh sign indicating number collection that is expanded of individual symbol comprises having 2 ^KThe Walsh code word that all of individual symbol are single and have 2 ^KThe combination of two Walsh code words of all of individual symbol;

The information word map that each is different is concentrated code word simple or combination to described Walsh sign indicating number; With

Will be corresponding to all code word additions of described different information words, obtaining a length is 2 ^KThe Walsh code word that is added of individual symbol.

23. a method that is become original information word by the combination Walsh codeword decoding of demodulation of utilizing orthogonal code to receive on telecommunication channel, described combination Walsh code word is 2 ^KIndividual symbol is long, comprises the Walsh code word of two or several quadratures, and described method may further comprise the steps:

Be given for the threshold value of maximum acceptable difference in the correlation of the Walsh code word that receives;

The combination Walsh code word of utilizing quick Hadamard transformation to receive resolves into each and has 2 ^KOne or more component Walsh code words of individual symbol;

According to the correlation between each component Walsh code word and the described combination Walsh code word that receives, with the component Walsh code word classification that is included in the described combination Walsh code word that receives;

If the difference between their correlation, is selected two component Walsh code words of high ordering less than the threshold value of described defined, otherwise only select the component Walsh code word of the highest ordering; With

Utilize map list to determine and the relevant information word of described selected Walsh code word.

24. one kind is utilized orthogonal code to having the information word Methods for Coding of 2K position, improves the code efficiency and the bandwidth usage of telecommunication channel, described method may further comprise the steps:

Information word is divided into first with K+M position and second portion with K-M position;

Utilize (2 ^K+M, K+M) the Walsh sign indicating number obtains having 2 to the described first coding of the information word of K+M position ^K+MThe one Walsh code word of individual symbol;

Utilize (2 ^K-M, K-M) the Walsh sign indicating number obtains having 2 to the described second portion coding of the information word of K-M position ^K-MThe 2nd Walsh code word of individual symbol;

With a described Walsh code word and described the 2nd Walsh code word cascade, obtain having 2 ^K+M+ 2 ^K-MA Walsh code word that is added of individual symbol; With

Modulation also aloft sends on the interface and describedly has 2 ^K+M+ 2 ^K-MThe Walsh code word that is added of individual symbol.

25. a method that is demodulated to original information word by the Walsh Codeword Sets that is cascaded of demodulation of utilizing orthogonal code to receive on telecommunication channel, the described Walsh Codeword Sets that is cascaded is 2 ^K+M+ 2 ^K-MIndividual symbol is long, comprises that two length that sequentially send are 2 ^K+MIndividual symbol and 2 ^K-MThe Walsh code word of individual symbol, described method may further comprise the steps:

The Walsh Codeword Sets that receives is separated into has 2 ^K+MThe first component Walsh code word of individual symbol and have 2 ^K-MThe second component Walsh code word of individual symbol;

Each described first component Walsh code word is transformed into the message part word with K+M position;

Each described second component Walsh code word is transformed into the message part word with K-M position; With

With each recovers to have the original information word of 2K position by they received order cascades in described two the message part words that are transformed.

26. a method that is decoded into original information word by the Walsh Codeword Sets that is cascaded of demodulation of utilizing orthogonal code to receive on telecommunication channel, the described Walsh Codeword Sets that is cascaded is that M takes advantage of 2 ^KIndividual symbol is long, and comprise each 2 ^KM the Walsh code word that sequentially sends that individual symbol is long, described method may further comprise the steps:

The Walsh Codeword Sets that receives is separated into M component Walsh code word, and each has 2K symbol;

With each is transformed into a message part word with K position in described M the component Walsh code word; With

With each recovers to have the original information word that K takes advantage of the M position by the order cascade of predesignating in described M the message part word that is transformed.

27. method as claim 26, be used for and will utilizing the Walsh Codeword Sets that is cascaded by demodulation that receives on the telecommunication channel of orthogonal code to be demodulated to original information word, wherein said M message part word that is transformed be by the order cascade by they received.

28. one kind be used for will have the system of raw information word code of K position improve the code efficiency and the bandwidth usage of the telecommunication channel that utilizes orthogonal code; Described system comprises:

Be used for original information word is divided into the device of M partial words, each has K respectively in the described M partial words ₁, K ₂..., K _MThe position;

Be used for by each partial words is integrated with relevant N position index word, device with each expansion in described M the partial words of original information word, described relevant N position index word comprises a unique identifier, it and a specific partial words are interrelated, and the length of index word is subjected to relational expression N 〉=[log ₂M] constraint;

Be used for utilizing ( , K _m+ N) the Walsh sign indicating number is to K _mThe described partial words apparatus for encoding that is expanded of each of+N position is had

A Walsh code word that is expanded of individual symbol, wherein m gets l and comprises between the M integer value of order; With

Be used for device, obtain one and have M Walsh code word addition that is expanded The walsh code word that is added of individual symbol, wherein K _Max=max[K ₁, K ₂... K _M].

29. as the system of claim 28, be used to improve the code efficiency and the bandwidth usage of a channel that utilizes orthogonal code, wherein original partial words is divided into two partial words.

30. as the system of claim 29, be used to improve the code efficiency and the bandwidth usage of a channel that utilizes orthogonal code, wherein two described partial words equate on length.

31. as the system of claim 28, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, comprise in addition:

Be used for modulation and aloft send on the interface describedly having The Walsh code word that is added of individual symbol.

32. system as claim 31, be used to improve the code efficiency and the bandwidth usage of the telecommunication channel that utilizes orthogonal code, as being applied to code division multiple access (CDMA) telecommunication system, the wherein said device that is used to modulate the described Walsh code word that is added comprises the device that was used for before modulation waveform signal spread-spectrum in addition.

33. as the system of claim 31, be used to improve the code efficiency and the bandwidth usage of a long-range channel all that utilizes orthogonal code, comprise in addition:

Be used for aloft receiving on the interface and demodulation is described has 2 ^Kmax+NThe Walsh code word that is added of individual symbol.

34. a system that is used for the raw information word code with 2K position, improvement utilizes the code efficiency and the bandwidth usage of the telecommunication channel of orthogonal code, and described system comprises:

Be used for original information word is divided into the device of first and second portion, each described part has the K position;

Be used for the first of described original information word and the device of single position cascade with 0 value;

Be used for the second portion of described original information word and the device of single position cascade with 1 value;

Be used for utilizing (2 ^K+1, K+1) the Walsh sign indicating number obtains having 2 to first's apparatus for encoding that described K+1 position original information word is cascaded ^K+1The one Walsh code word of individual symbol;

Be used for utilizing (2 ^K+1, K+1) the Walsh sign indicating number obtains having 2 to the second portion apparatus for encoding that the original information word of described K+1 position is cascaded ^K+1The 2nd Walsh code word of individual symbol; With

Be used for device, obtain having 2 a described Walsh code word and described the 2nd Walsh code word addition ^K+1The Walsh code word that is added of individual symbol.

35. system as claim 34, be used to utilize orthogonal code to improve the code efficiency and the bandwidth usage of a telecommunication channel, wherein said being used for is used for comprising with a part of device with the single position cascade with 0 value of described original information word with the device of described 0 prefix to the first of original information word.

36. system as claim 34, be used to improve the code efficiency and the bandwidth usage of the telecommunication channel that utilizes orthogonal code, wherein said being used for comprises the device that is used for described 0 suffix is arrived the first of original information word with the device of the first of described original information word and the single position cascade with 0 value.

37. system as claim 34, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, the wherein said device that is used for the second portion of described original information word and single cascade with 1 value comprises and being used for the device of described 1 prefix to the original information word second portion.

38. system as claim 34, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, wherein said being used for comprises the device that is used for described 1 suffix is arrived the second portion of original information word with the device of the second portion of described original information word and the single position cascade with 1 value.

39. as the system of claim 34, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, comprise in addition:

Be used for modulation and send on the interface to have 2 aloft ^K+1The device of the described Walsh code word that is added of individual symbol.

40. system as claim 39, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, as being applied to code division multiple access (CDMA) telecommunication system, the wherein said device that is used to modulate the described Walsh code word that is added comprises the device that was used for before modulation waveform signal spread-spectrum in addition.

41. as the system of claim 39, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, comprise in addition:

Be used for aloft receiving on the interface and demodulation is described has 2 ^K+1The device of the Walsh code word that is added of individual symbol.

42. as the system of claim 34, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, comprise the multiple antenna that is used to provide space diversity in addition.

43. as the system of claim 34, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, comprise the multiple antenna that is used to provide polarization and frequency separation in addition.

44. as the system of claim 34, be used to improve the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code, be included in the multiple antenna that uses in the transmission that TV and radio broadcasting broadcast simultaneously in addition.

45. one kind will utilized the system that is become original information word by the combination Walsh codeword decoding of demodulation that receives on the telecommunication channel of orthogonal code, comprise:

The combination Walsh code word of utilizing quick Hadamard transformation to receive resolves into the device of component Walsh code word;

Be used for each decoding of described component Walsh code word is obtained the device of relevant message part word;

Be used for described decoded message part word is separated into the device of first catalogue and second catalogue, described first catalogue is included in the decoded message part word that has 0 on the second place that the decoded message part word that has 1 on the primary importance of defined and described second catalogue be included in defined;

Be used for by the correlation that between component Walsh code word relevant and the described combination Walsh code word that receives, descends device first directory sorting of described decoded message part word with the message part word of described first catalogue;

Be used for by the correlation that between component Walsh code word relevant and the described combination Walsh code word that receives, descends device second directory sorting of described decoded message part word with the message part word of described second catalogue;

Be used for by selecting the highest ordering from described first catalogue the message part word and from 1 of the primary importance deletion of defined, the device of the synthetic first data division word;

Be used for by selecting the highest ordering from described second catalogue the message part word and from 0 of the second place deletion of defined, the device of the synthetic second data division word;

Be used for described first and second data words obtaining the device of original information word by specific order cascade.

46. as the system of claim 45, be used for and will utilizing the combination Walsh codeword decoding that receives on the telecommunication channel of orthogonal code to become original information word by demodulation, wherein said 1 by suffix to described data division word.

47. as the system of claim 45, be used for and will utilizing the combination Walsh codeword decoding that receives on the telecommunication channel of orthogonal code to become original information word by demodulation, wherein said 1 by prefix to described data division word.

48. as the system of claim 45, be used for and will utilizing the combination Walsh codeword decoding that receives on the telecommunication channel of orthogonal code to become original information word by demodulation, wherein said 0 by suffix to described data division word.

49. as the system of claim 45, be used for and will utilizing the combination Walsh codeword decoding that receives on the telecommunication channel of orthogonal code to become original information word by demodulation, wherein said 0 by prefix to described data division word.

50. one kind is used for improving the code efficiency and the bandwidth usage of a telecommunication channel that utilizes orthogonal code to having the system that M takes advantage of the raw information word code of K position binary message, described system comprises:

Be used for original information word is divided into the device of M message part word, each has the K position in described M the message part word;

Be used for the device with described M message part word each and N index bit cascade, wherein N is on length and be not less than [log ₂M], be used for m ^ThThe index bit of message part word is the binary representation of m-1;

Utilize (2 ^K+N, K+N) the Walsh sign indicating number obtains one group of M Walsh code word to the device of the described message part word code that is cascaded in K+N position; Each has 2 ^K+NIndividual symbol; With

Be used for device, obtain having 2 the code word addition of described M Walsh Codeword Sets ^K+NThe Walsh code word that is added of individual symbol.

51. one kind is used for and will utilizing the system that is become original information word by the combination Walsh codeword decoding of demodulation that receives on the telecommunication channel of orthogonal code, described combination Walsh code word is 2 ^K+NIndividual symbol is long, and comprises the Walsh code word of M quadrature, and described system comprises:

The combination Walsh code word that is used to utilize quick Hadamard transformation to receive resolve into each 2 ^K+NThe device of the M at least of individual symbol component Walsh code word;

Be used for the device with described M at least each decoding of component Walsh code word, obtain M message part word at least, wherein each is that the K+N position is long;

Be used for all dividing the binary value of each N certain bits of word described M at least decoded message part word to be categorized into the device of M catalogue according to M decoded information;

Be used for the correlation that descends by between described catalogue component Walsh code word relevant and the described combination Walsh code word that receives, with the device of each ordering in M the catalogue of decoded message part word with decoded message part word;

Be used for synthesizing the device of M data partial words by each N index bit selecting the decoded message part word of the highest ordering and deletion described decoded message part word, to be comprised from a described M catalogue; With

Be used for described M data partial words by specific order cascade to obtain the device of original information word.

52. a system that is used for the raw information word code with 2K+1 position binary message, improvement utilizes the code efficiency and the bandwidth usage of a telecommunication channel of orthogonal code, and described system comprises:

Being used to set up length is 2 ^KThe device of the Walsh sign indicating number collection of individual symbol, this yard collection comprises that all have 2 ^KThe single Walsh code word of individual symbol and all have 2 ^KThe combination of two Walsh code words of individual symbol;

Be used for the information word map that each is different and concentrate the device of the code word of simple or combination to described Walsh sign indicating number; With

Being used for being obtained length mutually corresponding to all code words of described different information words is 2 ^KThe device of the Walsh code word that is added of individual symbol.

53. one kind is used for and will utilizing the system that is become original information word by the combination Walsh codeword decoding of demodulation that receives on the telecommunication channel of orthogonal code, described combination Walsh code word is 2 ^KIndividual symbol is long, and comprises the Walsh code word of two or several quadratures, and described system comprises:

Be used for being defined in the device of threshold value of the maximum acceptable difference of correlation of the Walsh code word that receives;

The combination Walsh code word of utilizing quick Hadamrd conversion to receive resolves into each and has 2 ^KThe device of one or more component Walsh code words of individual symbol;

Be used for to be included in the device of the component Walsh code word classification of the described combination Walsh code word that receives according to the correlation between each component Walsh code word and the described combination Walsh code word that receives;

If be used for difference between their correlation, select two component Walsh code words of high ordering, otherwise only select the device of the component Walsh code word of the highest ordering less than the threshold value of described defined; With

Be used to utilize map list to determine and the relevant information word device of described selected Walsh code word.

54. a system that is used for the information word coding with 2K position, improvement utilizes the code efficiency and the bandwidth usage of the telecommunication channel of orthogonal code.Described system comprises:

Be used for information word is divided into first with K+M position and the device with second portion of K-M position;

Be used for utilizing (2 ^K+M, K+M) the Walsh sign indicating number obtains having 2 to the described information word first apparatus for encoding of K+M position ^K+MThe one Walsh code word of individual symbol;

Be used for utilizing (2 ^K-M, K-M) the Walsh sign indicating number obtains having 2 to the described information word second portion apparatus for encoding of K-M position ^K-MThe 2nd Walsh code word of individual symbol;

Be used for device, obtain one and have 2 a described Walsh code word and described the 2nd Walsh code word cascade ^K+M+ 2 ^K-MThe Walsh code word that is added of individual symbol;

Be used for modulation and send on the interface describedly have 2 aloft ^K+M+ 2 ^K-MThe device of the Walsh code word that is added of individual symbol.

55. one kind will utilized the system that is become original information word by the Walsh codeword decoding that is cascaded of demodulation that receives on the telecommunication channel of orthogonal code, the described Walsh Codeword Sets that is cascaded is 2 ^K+M+ 2 ^K-MIndividual symbol is long, and comprises that two length are 2 ^K+MIndividual symbol and 2 ^K-MThe Walsh code word that the order of individual symbol sends, described system comprises:

The Walsh Codeword Sets that is used for receiving splits into has 2 ^K+MThe first component Walsh code word of individual symbol and have 2 ^K-MThe device of the second component Walsh code word of individual symbol;

Each is transformed into the device of the message part word with K+M position with the described first component Walsh code word to be used for utilizing map list;

Each is transformed into the device of the message part word with K-M position with the described second component Walsh code word to be used for utilizing map list; With

Be used for the device of each order cascade that is received by them of described two the message part words that are transformed with the raw information of recovering to have the 2K position.

56. one kind is used for and will utilizing the system that is become original information word by the Walsh codeword decoding that is cascaded of demodulation that receives on the telecommunication channel of orthogonal code, the described Walsh Codeword Sets that is cascaded is that M takes advantage of 2 ^KIndividual symbol is long, and comprises that each length is 2 ^KThe M of individual symbol the Walsh code word that order sends, described system comprises:

The Walsh Codeword Sets that is used for receiving splits into each and has 2 ^KThe device of the M of individual symbol component Walsh code word;

Be used for described M component Walsh code word the device that each utilizes map list to be transformed into to have the message part word of K position; With

Be used for each the order cascade that is received by them of message part word that described M is transformed to recover to have the device that K takes advantage of the original information word of M position.

57. system as claim 56, be used for and will utilizing the Walsh Codeword Sets that is cascaded by demodulation that receives on the telecommunication channel of orthogonal code to be decoded into original information word, wherein said M message part word that is transformed be by the order cascade that is received by them.

Images